id	domain	url
ecj-7381	dx.doi.org	http://dx.doi.org/10.1155/2014/576259
ecj-7381	www.mhlw.go	https://www.mhlw.go
ecj-7381	www.un.org	http://www.un.org/en/development/desa/publications/worldpopulation-prospects-2015-revision.html